How to directly deliver event's payload to HTTPTrigger?

[sugaf1204]

Is your feature request related to a problem? Please describe.
I would like to directly delivery payload which GitHub Webhook send to HTTPTrigger.

I can't find out sepecifing root of json objects in sjson.

Describe the solution you'd like
When payload attr of HTTPTrigger is null, payload is empty now.
https://github.com/argoproj/argo-events/blob/83c56bca7a3d2e1c9391b0ff5feb26b783d41802/api/sensor.md#httptrigger

argo-events/sensors/triggers/http/http.go

Line 134 in 83c56bc

t.Logger.Warnw("payload parameters are not specified. request payload will be an empty string", zap.Any("url", trigger.URL))

When payload attr (of HTTPTrigger or more) is null, deliver raw payload to HTTPTrigger, or add flag to do it.

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